Higgs Boson Production With A Top Quark Pair In The Diphoton Channel Double Higgs Production In The Bb Diphoton Channel And Inner Tracker Upgrade With The Atlas Detector At The Large Hadron Collider
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Higgs Boson Production With A Top Quark Pair In The Diphoton Channel Double Higgs Production In The Bb Diphoton Channel And Inner Tracker Upgrade With The Atlas Detector At The Large Hadron Collider
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Author : Alex Zeng Wang
language : en
Publisher:
Release Date : 2023
Higgs Boson Production With A Top Quark Pair In The Diphoton Channel Double Higgs Production In The Bb Diphoton Channel And Inner Tracker Upgrade With The Atlas Detector At The Large Hadron Collider written by Alex Zeng Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Since the discovery of the Higgs boson in 2012, the diphoton ([gamma][gamma]) decay channel of the Higgs boson has been one of the most potent channels due to the contrast between the smoothly falling background and sharply peaked signal in the diphoton invariant mass. In 2018, with up to 80 fb-1 of data at [square root]s = 13 TeV, ATLAS observed Higgs boson production in association with a pair of top quarks (ttH) with a significance of 5.8 [sigma] by combining measurements in the [gamma][gamma], bb, ZZ, and multi-lepton Higgs decay channels. The ttH production cross-section was measured to be 670 [plus or minus] 90 (stat) +110 -100 (syst) fb. The diphoton channel was one of the main contributors to this result, alone providing a significance of 4.1 [sigma]. With 140 fb-1, a search for non-resonant Higgs pair production in the bb[gamma][gamma] final state was performed. No significant signal was observed and upper limits at 95% confidence level were set. The observed limit on the SM cross-section was 130 fb, or 4.2 times the predicted value. The observed Higgs trilinear coupling modifier was constrained to be between [-1.5, 6.7]. Both the ttH (H [rightwards arrow] [gamma][gamma]) and HH bb[gamma][gamma] analyses will benefit tremendously from the increased statistics expected from the High-Luminosity LHC (HL-LHC). To ensure the continued efficiency of the detector in the harsh HL-LHC environment, ATLAS will install a new Inner Tracker (ITk) consisting of silicon pixel sensors in its innermost layer. At SLAC National Accelerator Laboratory, a variety of electrical tests are performed for the construction of a prototype integrated pixel system, in order to provide early feedback and validation of the ITk design.
Observation Of Higgs Boson Production In Association With A Top Quark Antiquark Pair In The Diphoton Decay Channel
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Author : Samuel James May
language : en
Publisher:
Release Date : 2020
Observation Of Higgs Boson Production In Association With A Top Quark Antiquark Pair In The Diphoton Decay Channel written by Samuel James May and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
This dissertation presents the first observation of Higgs boson production in association with a top quark-antiquark pair in the diphoton decay channel, with a significance of 6.6 standard deviations. The measurement is performed with a dataset of 13 TeV proton-proton collisions recorded by the Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC), corresponding to an integrated luminosity of 137 fb−1.
Measurements Of The Higgs Boson Inclusive And Differential Fiducial Cross Sections In The Diphoton Decay Channel With Pp Collisions At Square Root S
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Measurements Of The Higgs Boson Inclusive And Differential Fiducial Cross Sections In The Diphoton Decay Channel With Pp Collisions At Square Root S written by [Study Group] ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Abstract: A measurement of inclusive and differential fiducial cross-sections for the production of the Higgs boson decaying into two photons is performed using 139 fb−1 of proton-proton collision data recorded at s√ = 13 TeV by the ATLAS experiment at the Large Hadron Collider. The inclusive cross-section times branching ratio, in a fiducial region closely matching the experimental selection, is measured to be 67 ± 6 fb, which is in agreement with the state-of-the-art Standard Model prediction of 64 ± 4 fb. Extrapolating this result to the full phase space and correcting for the branching ratio, the total cross-section for Higgs boson production is estimated to be 58 ± 6 pb. In addition, the cross-sections in four fiducial regions sensitive to various Higgs boson production modes and differential cross-sections as a function of either one or two of several observables are measured. All the measurements are found to be in agreement with the Standard Model predictions. The measured transverse momentum distribution of the Higgs boson is used as an indirect probe of the Yukawa coupling of the Higgs boson to the bottom and charm quarks. In addition, five differential cross-section measurements are used to constrain anomalous Higgs boson couplings to vector bosons in the Standard Model effective field theory framework
Discovery Of The Higgs Boson Measurements Of Higgs Boson Properties And Search For High Mass Beyond The Standard Model Scalar Particle In The Diphoton Final State With The Atlas Detector At The Large Hadron Collider
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Author : Hongtao Yang
language : en
Publisher:
Release Date : 2016
Discovery Of The Higgs Boson Measurements Of Higgs Boson Properties And Search For High Mass Beyond The Standard Model Scalar Particle In The Diphoton Final State With The Atlas Detector At The Large Hadron Collider written by Hongtao Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
With 4.8~$\rm{fb}^{-1}$ of proton-proton collision data collected at $\sqrt{s}=7~\rm{TeV}$ in 2011, and 5.9~$\rm{fb}^{-1}$ collected at $\sqrt{s}=8~\rm{TeV}$ in 2012 by the ATLAS detector at the Large Hadron Collider, an excess of 4.5 standard deviations from the background-only hypothesis is observed near 126.5~GeV in the diphoton invariant mass spectra. Along with the excesses observed in the $H \rightarrow ZZ^{(*)}\rightarrow \ell\ell\ell\ell$ and $H \rightarrow WW^{(*)}\rightarrow \ell\nu\ell\nu$ channels, the observation of a Higgs-like particle is established at 6.0 standard deviations level. With more data accumulated during LHC Run~1, the measurements of Higgs boson couplings and mass in the $H\to\gamma\gamma$ channel are conducted by the ATLAS experiment based on 4.5~$\rm{fb}^{-1}$ of proton-proton collisions at $\sqrt{s}=7~\rm{TeV}$ collected in 2011, and 20.3~$\rm{fb}^{-1}$ at $\sqrt{s}=8~\rm{TeV}$ collected in 2012. The combined signal strength, defined as number of observed Higgs boson decays to diphoton divided by the corresponding Standard Model prediction, is measured to be $1.17 \ ^{+0.28}_{-0.26}$ assuming the Higgs boson mass being 125.4~$\rm{GeV}$. The signal strengths for individual Higgs boson production processes are also measured, and are found to be in good consistency with the Standard Model. The mass of the Higgs boson is measured in $H\to\gamma\gamma$ channel by the ATLAS experiment to be $125.98 \pm 0.50$~\GeV. This measurement is combined with the ones from ATLAS $H \rightarrow ZZ^{(*)}\rightarrow \ell\ell\ell\ell$ as well as CMS $H\to\gamma\gamma$ and $H \rightarrow ZZ^{(*)}\rightarrow \ell\ell\ell\ell$. The Higgs boson mass measured from the combination is $125.09\pm0.24~\rm{GeV}$. With LHC center-of-mass energy increased to 13~TeV, a search for high mass Beyond the Standard Model scalar resonance is performed in the diphoton decay channel based on 15.4~$\rm{fb}^{-1}$ of proton-proton collision data collected by the ATLAS detector during 2015 and 2016. While a notable wide excess was first observed in the diphoton invariant mass spectrum from the 2015 data (3.2~$\rm{fb}^{-1}$) with mass near 750~GeV, it is not confirmed by the 2016 data with much higher statistics (12.4~$\rm{fb}^{-1}$). Limits on the production cross section times branching ratio of such resonances are set.
Measurement Of Higgs Boson Decay Into B Quarks In Associated Production With A Top Quark Pair In Pp Collisions At Square Root S
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Measurement Of Higgs Boson Decay Into B Quarks In Associated Production With A Top Quark Pair In Pp Collisions At Square Root S written by [Study Group] ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Abstract: The associated production of a Higgs boson and a top-quark pair is measured in events characterised by the presence of one or two electrons or muons. The Higgs boson decay into a b-quark pair is used. The analysed data, corresponding to an integrated luminosity of 139 fb−1, were collected in proton-proton collisions at the Large Hadron Collider between 2015 and 2018 at a centre-of-mass energy of s√ = 13 TeV. The measured signal strength, defined as the ratio of the measured signal yield to that predicted by the Standard Model, is 0.35+0.36−0.34. This result is compatible with the Standard Model prediction and corresponds to an observed (expected) significance of 1.0 (2.7) standard deviations. The signal strength is also measured differentially in bins of the Higgs boson transverse momentum in the simplified template cross-section framework, including a bin for specially selected boosted Higgs bosons with transverse momentum above 300 GeV
Higgs From Top To Bottom
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Author : Tim Michael Heinz Wolf
language : en
Publisher:
Release Date : 2018
Higgs From Top To Bottom written by Tim Michael Heinz Wolf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
In the Standard Model (SM) of particle physics, it is expected that the Higgs boson as a scalar spin-0 particle gives mass to all other elementary particles. In addition, the coupling to the top quark, as the heaviest elementary particle, is expected to be of order unity. Proton--proton collision data at a center of mass energy of 13 TeV collected by the ATLAS experiment during Run 2 of the Large Hadron Collider is used to study the interaction between the Higgs boson and the top quark. Data of up to 79.8 fb−1 in various Higgs boson decay modes is analyzed to study Higgs boson production in association with a pair of top quarks (ttH) and probe the SM expectation. This thesis focuses on Higgs decays to bottom quarks and faces the challenges inherent to this decay mode such as limited amount of Monte Carlo statistics and limited understanding of the background modeling. In this thesis, the collected data is used to establish the Higgs boson-top quark coupling by combining analyses targeting different Higgs boson decay modes, employing cutting edge statistical methods. The extracted cross-section ratio with respect to the SM prediction of the ttH process is measured to be 1.32 (+0.28 -0.26) in agreement with the SM expectation. This constitutes a discovery with a significance of 5.8 standard deviations and establishes the coupling between the Higgs boson and the top quark.
Search For Resonant Higgs Boson Pair Production In The Semi Leptonic Bb Ww Decay Channel With The Atlas Detector At The Large Hadron Collider
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Author : Nurfikri Bin Norjoharuddeen
language : en
Publisher:
Release Date : 2018
Search For Resonant Higgs Boson Pair Production In The Semi Leptonic Bb Ww Decay Channel With The Atlas Detector At The Large Hadron Collider written by Nurfikri Bin Norjoharuddeen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Search For The Associated Production Of The Higgs Boson With A Top Quark Pair In Multilepton Final States With The Atlas Detector
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Author :
language : en
Publisher:
Release Date : 2015
Search For The Associated Production Of The Higgs Boson With A Top Quark Pair In Multilepton Final States With The Atlas Detector written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Search For Resonant Pair Production Of Higgs Bosons In The Bb Bb Final State Using Pp Collisions At S
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Search For Resonant Pair Production Of Higgs Bosons In The Bb Bb Final State Using Pp Collisions At S written by [Study Group] ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Abstract: A search for resonant Higgs boson pair production in the b ̄bb ̄b final state is presented. The analysis uses 126 fb−1-139 fb−1 of pp collision data at √s=13 TeV collected with the ATLAS detector at the Large Hadron Collider. The analysis is divided into two channels, targeting Higgs boson decays which are reconstructed as pairs of small-radius jets or as individual large-radius jets. Spin-0 and spin-2 benchmark signal models are considered, both of which correspond to resonant HH production via gluon-gluon fusion. The data are consistent with Standard Model predictions. Upper limits are set on the production cross section times branching ratio to Higgs boson pairs of a new resonance in the mass range from 251 GeV to 5 TeV
Discovery And Measurement Of The Higgs Boson In The Ww Decay Channel
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Author : David Hall
language : en
Publisher: Springer
Release Date : 2015-06-15
Discovery And Measurement Of The Higgs Boson In The Ww Decay Channel written by David Hall and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-15 with Science categories.
This thesis describes the stand-alone discovery and measurement of the Higgs boson in its decays to two W bosons using the Run-I ATLAS dataset. This is the most precise measurement of gluon-fusion Higgs boson production and is among the most significant results attained at the LHC. The thesis provides an exceptionally clear exposition on a complicated analysis performed by a large team of researchers. Aspects of the analysis performed by the author are explained in detail; these include new methods for evaluating uncertainties on the jet binning used in the analysis and for estimating the background due to associated production of a W boson and an off-shell photon. The thesis also describes a measurement of the WW cross section, an essential background to Higgs boson production. The primary motivation of the LHC was to prove or disprove the existence of the Higgs boson. In 2012, CERN announced this discovery and the resultant ATLAS publication contained three decay channels: gg, ZZ, and WW.